uvm_fault(0xffffffff83aa1d70, 0xffff800029ee6000, 0, 2) -> e kernel: page fault trap, code=2 Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *443136 85237 0 0 0 0 syz-executor kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a779d30) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a779d30,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 pool_get(ffffffff83a81330,2) at pool_get+0x1b8 sys/kern/subr_pool.c:594 pmap_enter(fffffd807668e950,25762147000,6ffad000,3,23) at pmap_enter+0x1dd sys/arch/amd64/amd64/pmap.c:-1 udv_fault(ffff80002a75d8c0,25762147000,ffff80002a75d840,1,0,0,2186f59831a01438,ffff80002a75d8c0) at udv_fault+0x1c7 sys/uvm/uvm_device.c:372 uvm_fault(fffffd807dbb62f8,25762147000,0,1) at uvm_fault+0x209 sys/uvm/uvm_fault.c:650 upageflttrap(ffff80002a75da60,25762147000) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a75da60) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aef2816b0e0, count: 1 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff83aa1d70, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a779d30) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a779d30,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 pool_get(ffffffff83a81330,2) at pool_get+0x1b8 sys/kern/subr_pool.c:594 pmap_enter(fffffd807668e950,25762147000,6ffad000,3,23) at pmap_enter+0x1dd sys/arch/amd64/amd64/pmap.c:-1 udv_fault(ffff80002a75d8c0,25762147000,ffff80002a75d840,1,0,0,2186f59831a01438,ffff80002a75d8c0) at udv_fault+0x1c7 sys/uvm/uvm_device.c:372 uvm_fault(fffffd807dbb62f8,25762147000,0,1) at uvm_fault+0x209 sys/uvm/uvm_fault.c:650 upageflttrap(ffff80002a75da60,25762147000) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a75da60) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aef2816b0e0, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80002a75d330 rbx 0xffff80002a79c910 rdx 0xffff80002a77d248 rcx 0xffff800029ee6000 rax 0xfffffd806caeee10 r8 0x23 r9 0 r10 0x18d4d22d39c9b45a r11 0xcc34133ec7efd424 r12 0xffffffff8246cba0 endtsleep r13 0xffff80002a779c98 r14 0xffff80002a79c910 r15 0 rip 0xffffffff82724642 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80002a75d310 ss 0 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=443136 pid=85237 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a77da10,0xffff80002a77c2c8 process=0xffff80002f0b1218 user=0xffff80002a758000, vmspace=0xfffffd807dbb62f8 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 32845 398880 26907 0 2 0x10 syz-executor 32845 44014 26907 0 3 0x4000090 fsleep syz-executor *85237 443136 67868 0 7 0 syz-executor 85237 68437 67868 0 3 0x4000080 fsleep syz-executor 18264 204516 14857 0 2 0 syz-executor 18264 446205 14857 0 3 0x4000080 ttyout syz-executor 19772 95286 77625 0 2 0 syz-executor 19772 250964 77625 0 3 0x4000080 sbwait syz-executor 21633 9632 17935 0 2 0 syz-executor 21633 348539 17935 0 3 0x4000080 fsleep syz-executor 53941 416491 61003 0 3 0x80 nanoslp syz-executor 53941 356161 61003 0 2 0x4000c80 syz-executor 7763 305305 74710 0 3 0x80 nanoslp syz-executor 7763 60111 74710 0 3 0x4000080 ttyout syz-executor 31586 58231 0 0 3 0x14200 acct acct 33353 472864 1 0 3 0x100083 ttyin getty 77625 165341 67231 0 3 0x82 nanoslp syz-executor 14857 115299 67231 0 3 0x82 nanoslp syz-executor 76978 54647 67231 0 3 0x82 piperd syz-executor 17935 244613 67231 0 3 0x82 nanoslp syz-executor 61003 175160 67231 0 3 0x82 nanoslp syz-executor 67868 23438 67231 0 3 0x82 nanoslp syz-executor 74710 162673 67231 0 3 0x82 nanoslp syz-executor 26907 311027 67231 0 3 0x82 nanoslp syz-executor 67231 139556 10101 0 2 0x2 syz-executor 10101 203071 89993 0 3 0x10008a sigsusp ksh 89993 262004 81158 0 3 0x98 kqread sshd-session 81158 297704 54036 0 3 0x92 kqread sshd-session 54036 399290 1 0 3 0x88 kqread sshd 35473 250858 64045 73 3 0x1100090 kqread syslogd 64045 117000 1 0 3 0x100082 sbwait syslogd 64759 269112 1 0 3 0x100080 kqread resolvd 48481 521227 34206 77 3 0x100092 kqread dhcpleased 99413 37327 34206 77 3 0x100092 kqread dhcpleased 34206 37160 1 0 3 0x80 kqread dhcpleased 43109 508166 0 0 3 0x14200 bored smr 38451 251915 0 0 2 0x14200 zerothread 58127 20016 0 0 3 0x14200 aiodoned aiodoned 26926 501235 0 0 3 0x14200 syncer update 72864 74033 0 0 3 0x14200 cleaner cleaner 67091 150874 0 0 3 0x14200 reaper reaper 93265 59464 0 0 3 0x14200 pgdaemon pagedaemon 97527 176474 0 0 3 0x14200 bored viomb 4959 276541 0 0 3 0x40014200 acpi0 acpi0 36613 518451 0 0 3 0x14200 bored softnet0 299 326751 0 0 3 0x14200 bored systqmp 86620 269090 0 0 3 0x14200 bored systq 57505 368069 0 0 3 0x40014200 tmoslp softclock 51005 138998 0 0 3 0x40014200 idle0 1 451906 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11037 12111K 12391K 166960K 13014 0 pcb 18 12K 12K 166960K 162 0 rtable 209 6K 10K 166960K 516 0 pf 33 14K 21K 166960K 240 0 ifaddr 37 7K 8K 166960K 96 0 ifgroup 42 1K 2K 166960K 140 0 sysctl 3 1K 9K 166960K 13 0 counters 31 17K 18K 166960K 79 0 ioctlops 0 0K 4K 166960K 154 0 iov 0 0K 12K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1293 81K 82K 166960K 1941 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 24K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 29 0 dirhash 12 2K 2K 166960K 48 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 85K 166960K 1230 0 sigio 0 0K 0K 166960K 12 0 proc 60 59K 83K 166960K 574 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 45 0 in_multi 77 5K 7K 166960K 169 0 ether_multi 1 0K 0K 166960K 24 0 mrt 1 0K 0K 166960K 51 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 421 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 209 150K 166K 166960K 11501 0 UVM aobj 9 2K 2K 166960K 11 0 pinsyscall 38 76K 90K 166960K 2360 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 54 0 NDP 10 0K 2K 166960K 64 0 temp 44 9104K 9170K 166960K 28625 0 kqueue 14 22K 27K 166960K 225 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 56 0 53 1 0 1 1 0 8 0 rtentry 136 148 0 57 5 0 5 5 0 8 1 unpcb 144 304 0 285 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 114 0 110 1 0 1 1 0 8 0 arp 96 23 0 6 1 0 1 1 0 8 0 ipq 40 5 0 1 2 1 1 1 0 8 0 ipqe 40 10 0 4 2 1 1 1 0 8 0 inpcb 328 470 0 463 2 0 2 2 0 8 1 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 112 32 0 12 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 38 0 38 2 1 1 1 0 8 1 pppxif 1416 5 0 5 1 0 1 1 0 8 1 pfrktable 1344 25 0 25 2 1 1 1 0 8 1 pfanchor 1288 14 0 11 2 1 1 1 0 8 0 pftag 88 9 0 4 2 1 1 1 0 8 0 pfrule 1360 30 0 29 2 1 1 1 0 8 0 rttmr 136 8 0 8 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 634 0 278 32 0 32 32 0 8 5 art_table 40 635 0 278 6 0 6 6 0 8 1 art_node 32 148 0 69 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semapl 64 26 0 16 1 0 1 1 0 8 0 shmpl 112 8 0 2 1 0 1 1 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 3365 0 1904 93 0 93 93 0 8 0 ffsino 256 3365 0 1904 93 0 93 93 0 8 0 nchpl 144 4786 0 3093 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 3717 0 0 207 0 207 207 0 8 0 namei 1024 13494 0 13494 3 2 1 2 0 8 1 pfiaddrpl 120 7 0 7 2 1 1 1 0 8 1 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 kstatmem 264 91 0 72 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 0 1 1 0 8 1 scxspl 216 21327 0 21327 11 3 8 8 1 8 8 plimitpl 152 221 0 202 1 0 1 1 0 8 0 sigapl 424 1530 0 1487 6 1 5 6 0 8 0 knotepl 120 41541 0 41493 18 8 10 10 0 8 8 kqueuepl 184 228 0 218 1 0 1 1 0 8 0 pipepl 304 136 0 109 3 0 3 3 0 8 0 fdescpl 448 1511 0 1482 4 0 4 4 0 8 0 filepl 120 5178 0 4958 7 0 7 7 0 8 0 lockfpl 104 213 0 211 1 0 1 1 0 8 0 lockfspl 48 85 0 83 1 0 1 1 0 8 0 sessionpl 144 50 0 42 1 0 1 1 0 8 0 pgrppl 48 61 0 45 1 0 1 1 0 8 0 ucredpl 104 1331 0 1318 1 0 1 1 0 8 0 zombiepl 144 1487 0 1487 2 1 1 1 0 8 1 processpl 1152 1530 0 1487 4 0 4 4 0 8 0 procpl 664 2783 0 2733 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 841 0 811 4 1 3 3 0 8 0 mcl64k 65536 508 0 508 2 1 1 1 0 8 1 mcl16k 16384 282 0 282 2 1 1 1 0 8 1 mcl12k 12288 109 0 109 2 1 1 1 0 8 1 mcl9k128 9344 50 0 50 2 1 1 1 0 8 1 mcl8k 8192 127 0 127 2 1 1 1 0 8 1 mcl4k 4096 4672 0 4616 16 8 8 16 0 8 0 mcl2k2 2112 9 0 9 2 1 1 1 0 8 1 mcl2k 2048 479 0 475 2 0 2 2 0 8 1 mtagpl 96 12 0 7 1 0 1 1 0 8 0 mbufpl 256 17499 0 17329 15 0 15 15 0 8 0 bufpl 280 6841 0 625 445 0 445 445 0 8 0 anonpl 24 192094 0 188976 74 11 63 63 0 186 26 amapchunkpl 152 38468 0 38036 33 8 25 27 0 158 7 amappl16 200 3673 0 3639 28 13 15 18 0 8 7 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 422 0 421 1 0 1 1 0 8 0 amappl13 176 116 0 106 1 0 1 1 0 8 0 amappl12 168 1753 0 1724 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 74 0 64 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 1 0 1 0 8 0 amappl8 136 194 0 193 1 0 1 1 0 8 0 amappl7 128 145 0 134 1 0 1 1 0 8 0 amappl6 120 157 0 156 1 0 1 1 0 8 0 amappl5 112 97 0 90 1 0 1 1 0 8 0 amappl4 104 262 0 247 1 0 1 1 0 8 0 amappl3 96 8349 0 8249 4 0 4 4 0 8 1 amappl2 88 526 0 475 2 0 2 2 0 8 0 amappl1 80 14829 0 14286 13 1 12 13 0 8 0 amappl 88 10724 0 10577 4 0 4 4 0 92 0 uvmvnodes 80 136 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 22 0 21 1 0 1 1 0 8 0 aobjpl 72 10 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1511 0 1482 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1511 0 1482 1 0 1 1 0 8 0 vmmpekpl 168 11649 0 11618 2 0 2 2 0 8 0 vmmpepl 168 99935 0 98177 95 2 93 93 0 357 11 vmsppl 368 1510 0 1482 4 1 3 4 0 8 0 rwobjpl 40 25972 0 25009 13 0 13 13 0 8 0 pdppl 4096 3028 0 2964 92 26 66 76 0 8 2 pvpl 32 720608 0 711570 169 18 151 151 0 265 50 pmappl 216 1510 0 1482 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 372 0 44 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a779d30) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a779d30,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 pool_get(ffffffff83a81330,2) at pool_get+0x1b8 sys/kern/subr_pool.c:594 pmap_enter(fffffd807668e950,25762147000,6ffad000,3,23) at pmap_enter+0x1dd sys/arch/amd64/amd64/pmap.c:-1 udv_fault(ffff80002a75d8c0,25762147000,ffff80002a75d840,1,0,0,2186f59831a01438,ffff80002a75d8c0) at udv_fault+0x1c7 sys/uvm/uvm_device.c:372 uvm_fault(fffffd807dbb62f8,25762147000,0,1) at uvm_fault+0x209 sys/uvm/uvm_fault.c:650 upageflttrap(ffff80002a75da60,25762147000) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a75da60) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aef2816b0e0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a79c910) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838e7440,ffff80002a779d30) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a779d30,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 pool_get(ffffffff83a81330,2) at pool_get+0x1b8 sys/kern/subr_pool.c:594 pmap_enter(fffffd807668e950,25762147000,6ffad000,3,23) at pmap_enter+0x1dd sys/arch/amd64/amd64/pmap.c:-1 udv_fault(ffff80002a75d8c0,25762147000,ffff80002a75d840,1,0,0,2186f59831a01438,ffff80002a75d8c0) at udv_fault+0x1c7 sys/uvm/uvm_device.c:372 uvm_fault(fffffd807dbb62f8,25762147000,0,1) at uvm_fault+0x209 sys/uvm/uvm_fault.c:650 upageflttrap(ffff80002a75da60,25762147000) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a75da60) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aef2816b0e0, count: -14